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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcb05c96896900b64e7033dc3df371246141f87d42e758d2f9639de8fc2056e' 
  AND token = 'WRRK6uubhZkd8BU9OIawfEwvKxzEZ0P8TIpbFBmytU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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