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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a001b7bf3f8ee471fb898b4baaa81bb46bd177abfff9f1e90ce64034fb5ecaec' 
  AND token = 'KrpjQ/2aQzZCWwBrvHra9q0jQ7+IPe717+POwQB7Tiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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