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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fb05b3d58d663414f3bfe767d4d6aaf6c98c37cb9a5e0f4abc9761585b65e2' 
  AND token = 'rAqT9eRJnzpzuvOGgQza1dSOXC+Hf9tyRw3Hhfk8sXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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