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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71380be7eb83627ac668f6bb7b93bcc099ba628fdb4493b6ff203e8e492c0df8' 
  AND token = 'FLfNbTxtCjV8fA05NBEYe2EsP+W00LYNt6jluWXpWJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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