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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f95a61b39237ba9256fbeb3c35ee132e8e91a6f2631b3611096ce6ea5eb49e' 
  AND token = '/y3u43g2ao0LdQFtN2OWjOwccSerPftKhsfqnNNMHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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