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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91ea0ca9bfc254244b4623f09968d2949dd2f52b2906ac458ac399fdbc096f2' 
  AND token = 'NafH97tOxMycTxL3N1QkPyXYwHundzA+HwKbfJ5kq0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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