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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c064118bfda00e043f3d42e4b220f7b1cf1fa86646443915d1b4ce061337c890' 
  AND token = '846r7XYvkf+OM1Qug6S56JR2+txJKA6b9eRt1bZoDNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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