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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e13b0c596c79d2d3c5e80beb40c9addde6c0dc5752db222db9e8821b64d0b9c' 
  AND token = 'ZNxBzDGiWFYwuu0rc676Vd4QPDneI6RXTlQEDwe93gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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