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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c24368dc95b81fe39bbfd51814e98f6d74cea789132d99d37810166e6e32761' 
  AND token = 'XRFj5C0OwB7RR0cobfEDP65Udo8JED3USq0BrzUc5Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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