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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fc8c20ab976419af1b3745d5869ad4101776ba1469edd25b9e0f09e861fa22' 
  AND token = '0VJD44zpSfAI7f6+0YZrRDZqZilVieqDp3riEG0IE18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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