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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f5ab2a52bdabb96fd147a4958b88f9dc5c2c28fb4d2d745c27f5d347041fd1' 
  AND token = 'wll0nPAxo0DJ/FZO6IrcvY7uT5WY2qQymtxQ1x9Lk74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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