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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a69fac943fcc008ed8fa1c01bf5c8ea001f8147e8051335be035eb454aff22' 
  AND token = 'VAALt9WzmXneKCemb4uwAXha1umF2rEVAcwu5mWvpgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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