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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad1193bb3a9df415c62ff4d9ae129de1e0e6823e634db0960312f7df7a303ef' 
  AND token = '/czJ6hRihYW42r9HomokoJsFLyMDjsnG+pKztmRSCx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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