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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7599842951564a18952382e168f6bc07b8905525577a963c0b809b98e72095' 
  AND token = 'C7zfCuKk/Iw7XjyUz7brCXonywf8s4g0UW1AkQgqBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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