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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcab0ce2e21d6b7d55151ee31d5efb2d6a9530c5f41849de1d1b9a02ed017df' 
  AND token = 'YLxP31qBuCTa4x1sYw+466nBzthabPBaKgD/vb+wQJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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