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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d83e9241d8ac1d80e408179db2aaf3383852a629a3e460903da51466e182bb' 
  AND token = 'x+fbd/ndXC1kw8vkaWMiJz+GbiNZqCN6Ng34lfuRb8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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