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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cc3335522c0ff694d1535b9c9bac41eb8d3aeb9e9466cd6641134d7237c1cb' 
  AND token = 'JQGoLoIq+bNnyqDGmQ4do5bjiuDinGY6Q6plxfthWBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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