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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc09f3b46dece417d45539730e751a70b449aaf2b746a741b26bca36045edf9' 
  AND token = '58PV1KJMTdBB15XR9NjBTIVl5nw82hrn0zt+7yUCrJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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