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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f423a9c192f692702b8544dfc69a0001f326c6377076353f5c0be449b76e028' 
  AND token = 'C3crz5IMEa+yltY7D3rAIzNofZt9fuOj3EqjKG+GGTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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