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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ebdb7cdf75ec6f8a8fd004f58becfcd63fd1618b715ddeb5e5ffbb096bf86a' 
  AND token = 'rIx4UQ+wJgq5T2pI+ErWJ+wagkc1m7MF5wXOpZzU7ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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