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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f724dd3dd5cfa5dd21677588dafbcb8ccbef136c3d7a598e7cbb6d3ce36fee0' 
  AND token = 'ATUOoC88TnLk2ncmFlGe2ElC2qEnXq3EhTpsu0Q+mbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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