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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70652f607842425a4d048168506af08a3bff59b1fa71e0b28f2844c892b96bf5' 
  AND token = 'HxDy/6i2ak+2We/tO60U5Nm37nlkyyQuMgtUKYznD30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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