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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff6349e510e7b972d1da6167dd72019e02eac2870408fc5c5509522e7a64b31' 
  AND token = 'a3+5crdu1feUZuU1XUxIc2b1rqPFEz1xMJCT+7KXWO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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