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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b21bb5a0c0601c8db08a9d78d0ea0e7a69609c94074e863e2cc4ec027ace71' 
  AND token = 'x9H+ZrptEB/bMYwIVGkBBeIUQxaVJS2ROzPMvjxXWaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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