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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476f95376ff4e84ff42b04f394a6ad06d6637b3c591a8009c48d823db2f7ace7' 
  AND token = '62SZj7uId71EOCaRqsAn4VeV0KhNW/jJcMRwjcSM/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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