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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c2c35a45c32b5912c35b6ae8b7056ea72b51a9a993a88e8728b55caa0671de' 
  AND token = '1qegO9YIKSFbnTG9HhwJIgMPUY/uRU/HQ6a7lJB8dCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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