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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dc7b7b5d8e2499449a4a8b67c28c9f7f5b5601120efe8370f2ec680455b32d' 
  AND token = 'f9SP0ggfW66tQUmwAov8orUFrUuwbOock9/nxRArhgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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