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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62d4bbf9fba5dc56446330065f870474d5f7c2bfb9c7a278a03eacdf933d024' 
  AND token = '/XGt9nwNqYhuBet+0uftGQoSdDyvUnoqoRtB4EjsQPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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