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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf4d10e6af6e5407b809f7720aa86250b4bfb306426c977a40c70b865d22c6d' 
  AND token = 'JZNjDETZ4do9ftEBcEkgfAJXqR0eog59UmGGNMvGxRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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