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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd844bf0d40e97640cc90017bedd9c17499c5a733f3f2a646aad49e58ceba952f' 
  AND token = 's4qbRjO+o8wF2M/Lf83dIHeIB1CSBsyjTiyB4QyEA3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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