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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49238a7492d8832c4ba32cc54a5be0e68aca4bc02bc10fc9794c752d2ef916de' 
  AND token = 'tMkSzcUFk0MCNQ9K6QEXQiJHahnPI7AAi7lgrRWNeeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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