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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7c3bc49833edbf767ac064540745e14426b4c0151de9d6e44c5758eb7b1c75' 
  AND token = 'AeM91AVwtResQJh1HrgFB1Rl3kUdaXev9rxip6R2Wco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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