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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17fb20bda27864f4ffddb7a4af92b4249fc45557814fb3e47fd7ef8f29dbc18f' 
  AND token = 'aJXC+NVeN1PbcmxeWc9EEaxj5W2RRKRL+RKV5fgOGz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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