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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f26b7954f5e9c91fb054740c040d9d1676ba5aeded23bc9c1ee55afc66f395' 
  AND token = 'h4Ejt3h+dJcfij6o2aNrpYklD//kCtyagI5Jw5w6bDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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