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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f1736c39bd44f975a0198180f36d2839cd659eb569a882b03ee14a84b2405b' 
  AND token = 'LRrfctJOiKO4XOcuhrN7pMQQEZv4efD4PZg7YrWWVGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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