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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb9c92cedadafd84b52c8c3592a5cda853623fbce52cf92074e2c16b68e5b1e' 
  AND token = 'XuwEdCR5cwd015ZnJBhGwvvwPL/poYDVqzpbeHv8344=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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