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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4565983db1fa474def045a9efcac73badeeb28cf7f02413a608907f0343284' 
  AND token = 'vUlbBrzikPPw9y4y5ANuT7n4gcjbw6bJCDN9MbJeLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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