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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491c999843223b01fdba911f7c935f813a42f85694054b3a6dfefa76937c3764' 
  AND token = 'ZyedAlFXZnrofUbNbvXUKyKveZ+zXWxfbc8pIAL1q94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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