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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4944b0fcca455ca890c05c64ebcea8bf880581f9e5de27d2e887cf51f309aca6' 
  AND token = 'KFINx0O+MY/f7kOka1HFHvR9Ku9zS26goBZK4n/TZ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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