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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6085462e2157bf58d25c61273e4371315a9bad9dbeec20da37de7fde824df19b' 
  AND token = 'E2pNDiykq75qPF6iNJkc6hJsRiWla7Kn5ejAiz7Tjd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}