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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c301483e1494e3e8c58d32215f4b1290fcdffff1b31bfcb24b5de714304a84' 
  AND token = 'y+HeyJ0a7eDEbZqssNaUWvcVOVdGPrHwphRZ1ocGqio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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