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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7e8d4f3133645c99971853e5e905911a44c2f541479496080a637772a5159c' 
  AND token = 'Cm0oyeWuZaX+QCJLS6MT409Ri66IWpsp651mC+Jsr9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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