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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e7c8257b90c5f5b9ea07f3772a756b11051396822b5fb83d22bea93f6de9bd' 
  AND token = '93OIw4ZeYqOSXQKCAwtuurayhtn4KcKtK9moL6PRhac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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