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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d28e42a6010564d45f1ceb88008285356850a0951c57035a6c4016fec19b6a3' 
  AND token = 'qwn7Wk8i1OBzfbgYAVbdNidXefAL4Nzpwx3CRLLAliI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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