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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d0349b6ab5395ff698f8a280600668941075aa628e4ab791b2d8541307617e' 
  AND token = 'tD5N1WCzH8JD2b9YDd+E1MqN8ukNaYMqoVYE6D8z0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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