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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20e2ea62f62a5b9c137e2cf864c89110a6c627f238c44a01ffd315709c0eeee' 
  AND token = 'ewLnILrOgn6vw5t2+djLgzyCKbp63tMX/+0mzkQ0C8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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