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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d111915904a467388e8ad1fd66dfe5124578923e30802be772b2ed7da9b5d3c' 
  AND token = 'tj1k9ddqWnNMZcaKRrdDRMPNfGr9m+Ltfou/pbtAoRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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