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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9665429ec243248b30b77bd0a4402a3eb22d540d0fa282378facdf3a7119c6' 
  AND token = '1PRW4J4sTT+geux/KknPzM7nDk47QnuhDHhHE/D+wps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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