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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90406996316a77cdaf0859be7b174b96c7a30930326356a7d89452ddd34b2b99' 
  AND token = 'FmC8vg9ENVgXBt01VQ4QCbqXDbzBKigxtKD93FEf810=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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