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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c667151e5b1f10e56a89a4fdd066b55f7ea2ae1390cf002abb70b7ad486e955' 
  AND token = '3h5a5SWnutj9q2sn3QylPpKVX2YnQz0ZMPNPxYuCFDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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