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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e714605428663dfba0dae813bc532253f517c4de1f2f9999bb9b2f0b6368720' 
  AND token = '45xx2l7ExTeBfoCX6l/wFbbo/1/gC7SutP/5U7jgNYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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