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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297fbfb3503f7bdd3aba5e1ebf9eddfb5aa1de54a474fc8d49af731fde478ce8' 
  AND token = 'Oz8/nOU3UWl0qGMLm19KGGqEK6iSlPtSMPB+1n9XfEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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