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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ad0c6f3a0f0e04633d169fc5a0674a1f061364be71e45a45560b5e225d35a' 
  AND token = 'WfrylH6r12yzCj3ydULzpvqb1cJshkwOOuZ+OkpCbUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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