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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607d70564314e5e0848c44dec245730bb4369da76251bc0ddd484d536f0d8c02' 
  AND token = 'VvrU56V9rGiQYDUR8Th5yzv8P5NgihbKNYWPwrhnrYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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