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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c433ab138b5871d7f13210b4379b91d7a8223497c0415351406633474ccb20bf' 
  AND token = 'o47Gyq3ANueXadkgQAtw01ItC/B0pDM5U8NSkyiMBbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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