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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0aaf1dbb7474b084bc8ec035dd6a700f379412998aabc6de843a42a56a27c0' 
  AND token = '3Ki8b/UidDZLVDO23QXftcFIo/AwBLoJOYujGAdMbfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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