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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48a023980270574e9f3f6f3b7d8c3740c8370352fb093850e1e8072171fe516' 
  AND token = 'ARXsqjWtWPNMbkgHXUt0+XCichyAwnYu87L2w07Jsn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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