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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bf04c40171ae3bfe9127b9f6fc52a6eb9b3f53b0778ad814ea839cc82f6d58' 
  AND token = 'h2pfYUuZbYNpW7Xwo3T1j7r858W3X5A9DcSBGi3e2lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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