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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bced8f33c80e0de468438a3d441ef53ceb38514179820570392461ab6bdd1122' 
  AND token = 'ayLUlvf3eH4tFlvDb8RtvElTghwIEcWzOqA/d5pizVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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