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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52b05c2f1a110ae839582cd2b5e140f02581f55f8b285976668a39970bfb9ad' 
  AND token = 'kVhzAE6lMlP80vZYMreyOLE7eONbe7Le8rbH2PEn2wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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