SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c03b0bdf1d5968757b54ce293dd86d4720bb2ee6ba67ea5938fdfc32b40196' 
  AND token = 'QeOqG4D1nlhY0i+/0vvHHCD/+fXMHhRLV2Xx3jE+Roc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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