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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99c9786317ac61bb334a4993cc98952c83386927620f95a1318339f4549258c' 
  AND token = 'tMaFL2jcQWkmo/dNtpGzA3Jg85DTzLFfIo94HJQy6O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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