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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7569e0e288f3d5d0f8279499685f95b2f4dc8a7452013173829f1d381812448' 
  AND token = '3/nPxJ87YiSdyXwj1U81kD8SKyQQT8q+mMKjFg7vGdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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