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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e5d33c898178181a6debe699d402a0bc2949e1162d9a9a37a8f87851985f44' 
  AND token = 'L87eeWMIjROy3YI4c+L+7X7JM5Lcs9N7W3cTsXCjt5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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