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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54724feb03a062f81f2c78f55f117888c733edfb24338f5a9c114b55815679ab' 
  AND token = 'cWXD6Fiz0vnC53VfmCThA8dcmJEjHtXpaYLFjSNJjOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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