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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43dc52998d7dd02e1eb2b9de46483471bd2c864635bc4caf3e34959d9f0eddc8' 
  AND token = '44LeIycQSteGN4uiddqMOWhOflGFzLgZVHdkjR94tMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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