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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69168da776cad48e132bfb449e720912e2503632a26f6b6dfb5675f1538bb541' 
  AND token = 'BhMzAGSaVj4mnq54LcAMDK8wH78pewj3Sj08a7tg0fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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