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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144ad445d9c5bd21ff26aa088200bafae26f64d44785c025b8bc482b890dae4d' 
  AND token = '2NYz7ubE8cbRx7J9xoss3mcA4iUydFx2HaSuNyR+eJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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