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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b179becc3b5f0b40eddcc9c4aedc93975a5bda000f7e1c0cc1abbf05c6130a9f' 
  AND token = '+NYj+iO6r/QsntT7TpvLNshD/Qj70okiusznY6zQdGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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